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Vulnerability record · CVE-2026-21715 · published 30 March 2026

CVE-2026-21715: Nodejs node.js incorrect permission assignment vulnerability

Nodejs · Node.Js

A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.

3.3 CVSS 3.0 Low EPSS 0.16% · top 95.8% CWE-732 · Incorrect permission assignment
3.3CVSS 3.0 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
1References
19 Aug 2026Last modified by NVD

Description

A flaw in Node.js Permission Model filesystem enforcement leaves `fs.realpathSync.native()` without the required read permission checks, while all comparable filesystem functions correctly enforce them. As a result, code running under `--permission` with restricted `--allow-fs-read` can still use `fs.realpathSync.native()` to check file existence, resolve symlink targets, and enumerate filesystem paths outside of permitted directories. This vulnerability affects **20.x, 22.x, 24.x, and 25.x** processes using the Permission Model where `--allow-fs-read` is intentionally restricted.

CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://nodejs.org/en/blog/vulnerability/march-2026-security-releases Vendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-21715), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.